Think about yawning. Yawn yawn yawn... yawn. Have you yawned yet? If so, it's probably because you come from a social species. Contagious yawning, unlike spontaneous yawning (the purpose of which ...
Think about yawning. Yawn yawn yawn... yawn. Have you yawned yet? If so, it's probably because you come from a social species. Contagious yawning, unlike spontaneous yawning (the purpose of which ...
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